Abstract
There is great interest today in fuels obtained by the use of various hydrogenation processes, which have the side effect of removing natural oxidation inhibitors from fuel distillates. Since fuels produced in this manner are highly susceptible to oxidation, they tend to attack certain fuel system materials, in particular the elastomeric components used in fuel pumps.* Fuels that have been subjected to hydrogenation and not stabilized with antioxidants also have adverse effects on another class of polymeric materials, the po!ysulfide sealants that are widely used in fuel tanks. Leaks caused by such fuels have been observed in service and also in experiments specifically designed to simulate service conditions. This deterioration shows up as softening of the sealant, the apperance of sediment in the fuel, and an increase in the gum content of the fuel.
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